Urbonas, Algimantas Pranas. “Sur la Mobilité Maximale D’une Classe Des Espaces Des éléments Hyper-Planiques”. Lietuvos matematikos rinkinys 40, no. spec. (December 18, 2000): 172–175. Accessed October 27, 2026. https://zurnalai.vu.lt/LMR/article/view/35092.